The God of Death Meets Zero
Shinigami to Zero no Taiketsu
"While working on salvaging the parts to complete his new Gundam Deathcythe Hell, Duo is captured and forced by Trant to test the ZERO System for OZ, but is driven nearly insane. He is rescued by Hilde as Trant attempts to fight in the Wing Zero. However, the ZERO System also drives Trant insane and he dies as a result of it."